Merge pull request #18 from pimoroni/feature/pps

Fix PPS for #14.

examples/pps.py

@@ -10,10 +10,15 @@
 
 gps = PA1010D()
 
+pulse_width = 100
+
+if len(sys.argv) > 2:
+    pulse_width = int(sys.argv[2])
+
 if sys.argv[1] == "on":
-    gps.send_command("PMTK255,1")
+    gps.send_command(f"PMTK285,4,{pulse_width}")
 else:
-    gps.send_command("PMTK255,0")
+    gps.send_command(f"PMTK285,0,{pulse_width}")
 
 result = gps.update()
 

library/pa1010d/__init__.py

@@ -9,6 +9,12 @@
 
 PA1010D_ADDR = 0x10
 
+PPS_DISABLE = 0
+PPS_AFTER_FIRST_FIX = 1
+PPS_3D_FIX_ONLY = 2
+PPS_3D_2D_FIX_ONLY = 3
+PPS_ALWAYS = 4
+
 
 class PA1010D():
     __slots__ = (
@@ -220,6 +226,15 @@ def update(self, wait_for="GGA", timeout=5):
 
         raise TimeoutError("Timeout waiting for {wait_for} message.".format(wait_for=wait_for))
 
+    def set_pps(self, mode, pulse_width=100):
+        if mode not in (0, 1, 2, 3, 4):
+            raise ValueError("Invalid PPS mode (0 to 4)")
+
+        if pulse_width > 900 or pulse_width < 1:
+            raise ValueError("Invalid PPS pulse_width (1 to 900ms)")
+
+        self.send_command(f"PMTK285,{mode},{pulse_width}")
+
 
 if __name__ == "__main__":
     gps = PA1010D()